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Tangent of a Circle 圓的切線
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
New Resources
直角坐標平面上的旋轉變換
Nested spiral octagon
近似值：有效數字
小数 的副本
長方體平面投影 (Codex版)
Discover Resources
翰林B4講p171_類8
Rolling Star
p10-7
圓周公式應用題2
多邊形面積(分割法)
Discover Topics
Diagrams
Multiplication
Solids or 3D Shapes
Logarithm
Secant Line or Secant